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The effect of crystalline structure on molecular effect in ion-induced electron emission

Authors
Journal
Vacuum
0042-207X
Publisher
Elsevier
Publication Date
Volume
82
Issue
9
Identifiers
DOI: 10.1016/j.vacuum.2007.12.003
Keywords
  • Ion-Induced Electron Emission
  • Molecular Effect
  • Ion Channeling
  • Transparency Model

Abstract

Abstract The results of experimental and theoretical study of the molecular effect in ion-induced electron emission from single crystal and polycrystalline materials are presented. It has been found that the electron emission yield γ 2 under N 2 + bombardment of a single crystal shows a dependence on ion incidence angle θ, which is analogous to the anisotropy of the yield γ 1 under N + impact. The ratio R 2( θ)= γ 2/2 γ 1<1 exhibits, for single crystals, a drastic angular dependence, which was successfully described on the basis of electron sweeping-out mechanism by conjunction of both the sharp channeling at θ< ψ L and the shadowing-caused bell-like pattern at θ> ψ L, the Lindhard angle.

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